【摘要】 本文介绍了在0.2×0.5×2.64m沸腾床模拟台上气——固动力特性的冷态试验,包括颗粒在床层中的运动规律、颗粒的扬析及床内气流动力场。所用物料有玻璃珠、溢流渣和石英砂。分别就双组分和宽筛分床料作出了各种单因素对扬析速率常数的关联曲线和幂函数表达式;利用回归分析建立了各因子的综合无因次关联式,揭示了颗粒扬析的基本机理及沸腾床内的一般规律。利用凹型布风装置,改变了床层气固动力结构,实现了改善颗粒燃烬度、提高燃烧效率的预期设想。更多还原

【Abstract】 This paper summaries the results about experimental investigation of gas solid kinetic characteristics at ambient temperature in fluidized bed with 0.2×0.5×2.64m, including the movement pattern of particles in the bed, fine elutriation and air kinetic characteristics. The materials used in present experiments are glass beads, overflow slag and silica sand. A group of relative functions of single variable are respectively set up for materials with two components and wide range size distribution. Dimensionless correlations are developed by means of regression result. The basic mechanism of fines elutriation and general regularity on FBB are proposed. With a concave distributor, the gas-solid kinetic characteristics in the bed are changed and the residence time of fines is increased.更多还原